I think you are going to need a lot more All Things Root forums for the Samsung Galaxy S5.
Here are the S5 model versions...
Samsung SM-G900F/SM-G900H - for Europe
Samsung SM-G900I - for Asia
Samsung SM-G900K/G900L/G900S - for Korea
Samsung SM-G900M - for Vodafone
Samsung SM-G900A - for AT&T
Samsung SM-G900T - for T-Mobile
Samsung SM-G900V - for Verizon
Samsung SM-G900R4 - for US Cellular
Samsung SM-G900P - for Sprint
Source and spec's.
Here are the S5 model versions...
Samsung SM-G900F/SM-G900H - for Europe
Samsung SM-G900I - for Asia
Samsung SM-G900K/G900L/G900S - for Korea
Samsung SM-G900M - for Vodafone
Samsung SM-G900A - for AT&T
Samsung SM-G900T - for T-Mobile
Samsung SM-G900V - for Verizon
Samsung SM-G900R4 - for US Cellular
Samsung SM-G900P - for Sprint
Source and spec's.